Hand piece for power driven tools



' May 7, 1940. J. HYDE HAND PIECE POWER DRIVEN TOOLS Filed June 28, 19382 Sheets-Sheet l Inventor Jaw . Z{7de By @nw ttnrneys May 7, 1940. J.HYDE HAND PIECE FOR POWER DRIVEN TOOLS Filed June 28, 1938 2Sheets-Sheet 2 Inventor A tiomeys Patented May 7, 1940 UNITED v STATESPATENT OFFICE HAND PIECE FOR POWER DRIVEN TOOLS John Hyde, Chicago, 111.Application June 28, 1938, Serial No. 216,340

2 Claims. (01. ma -a) This invention relates to hand pieces forpowerdriven tools and has for the primary object the provision of aneificient and inexpensive device of this character which will provide acoupling 5' betweena power driven flexible shaft and a tool of any kind,such as a brush employed for cleaning teeth and which may be easily andquickly operated to establish a driving connection between the shaft andtool and to interrupt said drive when desired and to permit the easyremoval of the tool when desiring to clean the latter or to substituteone tool for another.

With these and other objects in view, the invention consists in certainnovel features of construction, combination and arrangement of parts tobe hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following de- 3 scription and accompanying drawings, in which Figure1 is a side elevation showing a hand piece constructed in accordancewith my invention and illustrating the hand piece connecting a tool to aflexible shaft of a power source.

25 Figure 2 is a sectional view taken on line 2- of Figure l, with thehand piece actuated to establish a drive between the flexible shaft andthe tool.

Figure 3 is a side elevation partly in section 30 showing the hand piecepositioned to release the driving connection between the flexible shaftand the tool.

Figure 4 is a sectional view taken on line 44 of Figure 2.

35 Figure 5 is an end view illustrating a coupling sleeve. I

Figure 6 is a vertical sectional view showing the coupling sleeve.

Figure 7 is a side elevation illustrating a'mano drel.

Referring in detail to the drawings, the numeral I0 indicates a handpiece, the outer face of which may be knurled and is internally screwthreaded, as shown at II. The hand piece I0 is 5 in the form of a sleeveand is provided at one end with an inwardly extending flange l2 actingas a stop for a hand piece [3, the latter being in the form of anelongated tube. A plug l4 having a bore I5 is threaded into the handpiece l0. One 50 end of the bore I5 is enlarged to form a socket [6 forthe reception of one end of a flexible shaft housing H, the flexibleshaft being indicated by the character H3. The housing I! and theflexible shaft are connected in any well known man- 5 ner to a powersource I!) which in this instance is in the form of an electric motor.However, any other type of power source may be employed.

A bearing sleeve is :mounted in the hand piece l3 at one end thereof andhas a frictional fit therewith with one end extending outwardly 5 of thehand piece l3 and received within the flanged end of thehand piece H).The bearing sleeve carries set screws 2| for removably securing in oneend of the bearing sleeve a bearing block 22 having a borealigning withthe bore 15 1 of the plug [4 so as to permit the flexible shaft l8 afterextending through the bore l5 to extend through said bearing block 22.

A coupling element 23 is journaled in the bearing sleeve 20 with-one endresting on the bearing 15 block 22 and if desired anti-friction meansmay be placed between the bearing block and the coupling element 23. Oneend of the coupling element 23 has a socket to receive the end of theflexible shaft l8, the latter being secured in the 20 socket by a setscrew carried by the coupling element 23 and the other end of saidcoupling element has a socket 25 provided with angularly related facesto match angularly related faces formed on a shank 26 carried by thebutt end 21 25 of a mandrel 28. The butt end 21 of the mandrel 28includes an enlarged bearing portion 29 resting against one end of thecoupling element 23 and an internal shoulder 30 formed in the bearingsleeve 2|]. A packing gland 3| is carv30 ried by the bearing sleeve andcontacts the butt end 21 of the mandrel. A portion of the mandrel 28 istapered with the taper extending towards the free end of the mandrel andformed on the tapered portion is a plurality of spaced ribs 32 alsotapered towards the free end of the mandrel.

A combined stop and guide collar 33 is mounted in the hand piece l3through which slides the tapered portion of the mandrel 2B. A plug 34 isremovably mounted in the end of the sleeve l3 and has a bore throughwhich a shank 35 of a tool 36 extends. The tool in this instance is inthe form of a brush, as clearly shown in Figure 1.

The bearing sleeve 20 has .a groove 3'! in which operates a set screw38' carried by the hand piece I3 whereby the latter may be slid on thebearing sleeve towards and from the hand piece Ill. The bearing sleevetightly fits within the hand piece In and is relatively stationary withrespect 0 thereto.

Companion chuck jaws 39 are arranged in the hand-piece l3 between thecombined stop and guide collar 33' and the plug 34. Each jaw 39 has acurved face 40 to contact with the shank 35 a 4| of the jaws the latterwill rock on the pin.

and cause the curved faces of the jaws to grip the shank of the tool,thereby establishing a detachable driving connection between the mandreland the shank of the tool. It is to be understood that the jaws arefreely rotatable within the hand piece I3. I

In operation, with the butt end 21 of the mandrel connected to theflexible shaft, as described in detail, and with the motor in operation,and With the parts positioned as shown in Figure 3, the operator slidesthe hand piece !3 towards the hand piece I 0. The sliding movement ofthe hand piece !3 as described brings the jaws into engagement with thetapered portion of the mandrel causing said jaws to rock on the pin 42and thereby tightly grip the shank of the tool. A movement of the handpiece l3 away from the hand piece Ill disconnects the mandrel from thejaws also freeing the jaws from the shank of the tool so that the lattermay be pulled out of the jaws if desired.

It is believed that the foregoing description, when taken in connectionwith the drawings, will fully set forth the construction and advantagesof this invention to those skilled in the art to which such inventionrelates so that further detailed description will not be required.

Having described my invention, what I claim 1. In a device of the classdescribed an elongated tubular handle member having an opening at oneend for receiving the shank of a tool and a chamber therein with whichsaid opening communicates, elongated longitudinally extending jawmembers rotatably supported in the chamber, a fulcrum member engaged byintermediate parts of the jaw members, a supporting member by which thehandle member is supported for sliding movement longitudinally, and amandrel rotatably supported by said supporting member and adapted to berotated, said mandrel having a tapered end extending into the chamber,when the handle member is in retracted position, and extending betweenthe adjacent ends of the jawmembers to spread said ends apart and tocause the opposite ends to grip a tool shank passed through the openingsand said end of the mandrel frictionally engaging the said adjacent endsof the jaw members to cause r0- tary movement of the jaw members withthe mandrel, said tapered end of the mandrel mov ing out of the chamberand out of engagement with the jaw members when the handle member isprojected.

2. In a device of the class described, a supporting member, an elongatedtubular handle member having one end portion slidably fitting over aportion of the supporting member, a mandrel having one end rotatablysupported by said portion of the supporting member with said mandrellocated in the handle member and said mandrel adapted to be rotated, a,chamber in the tubular member adjacent its other end, said other endhaving an opening therein which communicates with the chamber and isadapted to receive the shank of a tool, a pair of jaw members rotatablyarranged inthe chamber, a fulcrum member engaged by intermediateportions of the jaw members for rocking movement of the jaw members, thefree end of the mandrel being tapered and roughened and said endentering the chamber and passing between the inner ends of the jawmembers, when the handle member is retracted on the supporting memberand said free end of the mandrel being withdrawn from the chamber andfrom between the jaw members when the handle member is projected on thesupporting member.

JOHN HYDE.

